IWC Calatrava Jumbo Ref.R804A Cal.8541 36.5mm 1966

The Calatrava Jumbo Ref.R804A pairs a generous 36.5mm case with the disciplined simplicity of mid-century IWC design. A silver sunburst dial, polished dauphine hands and applied markers create a quiet play of light beneath the domed crystal. The celebrated Cal.8541 brings Pellaton winding and enduring mechanical character to this poised dress watch.

In addition, this timepiece comes freshly serviced with all parts laid out by our professional watchmaker for all to see in the images above. Little to no other dealers do this and it’s a testament to full transparency here at Montre D’or. With the Cal.8541 inside running excellently as shown in the timegrapher reading above, just like it was when it left the factory nearly half a century ago.

DIAL:

• Original silver sunburst dial in excellent vintage condition
• Polished dauphine hands without lume
• Applied hour indices with polished finish and black inserts
• Original applied IWC logo and crisp original wording
• Date window at 3 o’clock with semi-quickset feature
• Domed acrylic crystal

CASE:

• Distinctive polished round jumbo case with sharp tapered lugs
• 36.5mm Diameter (excluding crown)/ 44.0mm Lug-to-lug / 9.0mm Thickness
• Professionally polished with all sharp edges intact
• Original IWC-signed fish-logo crown at 3 o’clock

CASEBACK:

• Press-fit stainless steel caseback
• Professionally polished to perfect vintage condition
• Comes with plastic protective sticker as shown

MOVEMENT:

• IWC Cal.8541 – Automatic Pellaton-winding movement
• 23 jewels / 44.0-hour power reserve / 19,800 BPH
• Semi-quickset date by moving the hands back and forth across midnight; follow the watchmaker’s setting instructions
• Movement freshly serviced and in excellent condition

STRAP:

• Handmade leather strap, colour and design can be changed upon request depending on availability
• Aftermarket IWC stainless steel buckle

AFTERCARE PACKAGE:

• Comes with a black presentation box + silica gel
• Complimentary PolyWatch crystal polishing kit (for acrylic crystal)
• 6-month warranty (covers non-user damage only)
• Guarantee Certificate with full service details included
• Access to our exclusive post-warranty repair services
• 7-day return policy for peace of mind

SPECIFICS:

Maker: IWC

Model: Calatrava Jumbo

Year: 1966

Case Material: Stainless steel

Reference: R804A

Movement Serial: 1768227

Case Serial Number: 1785247

Caliber: 8541

Diameter: 36.5mm

Lug to lug: 44.0mm

Lug width: 18.0mm

Thickness: 9.0mm

Lume: None

Strap: Handmade leather strap

Box and papers: No original box or papers; Montre D’or black presentation box + Guarantee Certificate included

Accuracy: -1s/day

Movement type: Automatic Pellaton winding

Crystal: Domed acrylic crystal

Crown: Original IWC-signed fish-logo crown at 3 o’clock

Last service: September 2026

Free express tracked shipping with signature upon delivery. Delivery within Singapore in 1-2 working days. International shipping may take 2–12 working days depending on destination and will be shipped via FedEx/UPS/Aramex/SingPost

Do note respective custom duties might apply which includes the recent US tariffs and are the buyer's responsibility.

Do note that for US and South America bound shipments the PolyWatch polishing kit will not be included in order to mitigate customs delay due to customs requirements

Countries that we do not ship to: Afghanistan, Belarus, the Central African Republic, Chad, Cuba, the Democratic Republic of the Congo, Eritrea, Iran, Iraq, Lebanon, Libya, Israel, North Korea, Oman, Pakistan, Russia, Somalia, South Sudan, Syria, Ukraine and the Crimea, Donetsk, and Luhansk regions of Ukraine.

This is a vintage timepiece and water resistance is not guaranteed. Please avoid contact with water or moisture. Store the watch with dry tissue or silica gel to preserve its condition. We are not liable for water damage post-purchase.